Index: tools/gn/bootstrap/bootstrap.py
diff --git a/tools/gn/bootstrap/bootstrap.py b/tools/gn/bootstrap/bootstrap.py
index 38cfb117d29c3895291379f00d8dc8c8b0727474..679170e610f8292bcbeb76508fd247d322a69c79 100755
--- a/tools/gn/bootstrap/bootstrap.py
+++ b/tools/gn/bootstrap/bootstrap.py
@@ -385,6 +385,7 @@ def write_gn_ninja(path, root_gen_dir, options):
       'base/base_switches.cc',
       'base/build_time.cc',
       'base/callback_internal.cc',
+      'base/callback_helpers.cc',
       'base/command_line.cc',
       'base/debug/activity_tracker.cc',
       'base/debug/alias.cc',
